Title of Invention

A DEVICE FOR MONITORINGTHEFLAME INTENSITY INSIDE THE BLAST FURNACE THORUGH TUYERES.

Abstract

A device for monitoring the flame intensity inside a blast furnace through tuyeres, comprising a lens assembly fitted to the tuyere of the blast furnace; a fiber optic light guide, one end of which is attached to said lens assembly; a photo detector connected to the other end of said fiber optic light guide, for outputting an electrical signal to a programmable logic controller of a HMI system for displaying the intensity level of the flame inside said blast furnace.

Full Text

Field of the Invention: The present invention relates to a device for monitoring the flame intensity inside the blast furnace through tuyeres. Background and prior art: Flame inside the blast furnace around raceway zone is visible through flame peephole of tuyeres. Operators can physically inspect the flame intensity through peephole of tuyeres and conclude regarding hanging in the furnace, scab in the tuyer zone and burden distribution inside the furnace. The number of tuyeres can vary from furnace to furnace. A typical furnace may have 22 tuyeres. In the existing system the operators need to monitor physically all the tuyeres every half an hour resulting in delay in detecting a fault. The main object of the present invention therefore, is to detect instantaneously a fault in a particular tuyere. This object is achieved in the present invention by providing a device for monitoring the flame intensity levels of all the tuyeres and to display these intensity levels on a monitor of a central Human Machine Interface HMI. This HMI can be provided at the central room for the operators to monitor the tuyeres. Korean patent publication KR 1003 76525B discloses apparatus and method for monitoring Wast furnace raceway. It discloses acquiring of luminance data for race way of blast furnace, but the present invention has the uridermentioned distinguishing features over this publication. 1. The present invention does not disclose CCD, which makes it simpler and cost effective. 2. The present invention uses special lens attached to the tuyer. The tens has to be high temperature resistant because of the high temperature of the area where it is mounted. This is an advantageous distinguishing feature, as it makes the detection much simpler and cheaper. KR 1003 765256 employs entirety different technique. 3. The above publication discloses use of sound wave flow meter, which is not used in the present invention. 4. As the present invention does not deploy CCD, the necessity of obtaining luminance gradient for pixel, a complicated step, is avoided. Japanese patent publication JP 2000 086263 discloses a device for drawing an optical fiber pre-form. The disclosed invention relates to a totally different field. Although detection of change in luminous intensity is disclosed, the photo detector disclosed is totally different from that of the present invention. The response for wavelength range is entirely different. Moreover, no direction of detection is necessary in the present invention A fiber optic light guide is fitted at one end to a tens assembly provided on a tuyere of a blast furnace. The other end of the fiber optic light guide can be connected to a photo detector. The photo detector comprises a photo detector amplifier, a voltage to milli amp converter and a DC power supply. This photo/detector can output an electrical signal representing the intensity of the flame and hence the temperaure of the hot Metal inside the blast furnace. The output signal comprising 4—20 A can be connected to a programmable logic controllewr of a Hfll system and the monitor can provide the intensity level of the flame. Thus the present invention provides a device for monitoring the flame intensity inside a blast furnace through tuyeres, comprising a lens assembly fitted to the tuyere of the blast furnace, a fiber optic ligh guide, one end of which is attached to said lens assembly, a photo detector connected to the other end of said fiber optic light guide, for outputting an electrical signal to a programmable logic controller of a HHI system for displaying the intensity level of the flame inside said blast furnace. If the intensity level falls below certain predetermined level the HWI system can generate an alarm and a fault can be detected for a particular tuyere instantaneously. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1 shows the arrangement of the tuyere of a blast furnace. WE CLAIM: 1. A device for Monitoring the flame intensity inside a blast furnace through tuyeres, comprising : - a lens assembly fitted to the tuyere of the blast furnace; - a fiber optic light guide, one end of which is attached to said lens assembly; - a photo detector connected to the other end of said fiber optic light guide, for outputting an electrical signal to a programmable logic controller of a MMI system for displaying the intensity level of the flame inside said blast furnace. 2. The device as claimed in claim 1, wherein said photo detector is a In6aAs IR detector. 3. The device as claimed in claims 1 or 2, wherein said photo detector comprises a photo detector amplifier, a voltage- mi Hi amp converter and a DC power supply. 4. The device as claimed in the preceding claims, wherein said HMI system is configured to generate an alarm indicating a fault when the flame intensity falls below a predetermined level. 5. A device for monitoring the flame intensity inside a blast furnace through tuyeres substantially as herein described and illustrated in the figures of the accompanying drawings. A device for monitoring the flame intensity inside a blast furnace through tuyeres, comprising a lens assembly fitted to the tuyere of the blast furnace; a fiber optic light guide, one end of which is attached to said lens assembly; a photo detector connected to the other end of said fiber optic light guide, for outputting an electrical signal to a programmable logic controller of a HMI system for displaying the intensity level of the flame inside said blast furnace.

Documents:

480-KOL-2004-(05-12-2011)-FORM-27.pdf

480-kol-2004-granted-abstract.pdf

480-kol-2004-granted-claims.pdf

480-kol-2004-granted-correspondence.pdf

480-kol-2004-granted-description (complete).pdf

480-kol-2004-granted-drawings.pdf

480-kol-2004-granted-examination report.pdf

480-kol-2004-granted-form 1.pdf

480-kol-2004-granted-form 13.pdf

480-kol-2004-granted-form 18.pdf

480-kol-2004-granted-form 2.pdf

480-kol-2004-granted-form 3.pdf

480-kol-2004-granted-gpa.pdf

480-kol-2004-granted-reply to examination report.pdf

480-kol-2004-granted-specification.pdf